To provide a foldable table for preventing the action of a caster through a linking mechanism by the displacement of a shelf member linked with a top plate at the time of horizontally extending the top plate and turning the table to a using state.

The base end of a shelf member 21 is pivotally attached by a shaft P1 and horizontally extended to a stud 3 and a stay member 22 is pivotally attached between the shelf member 21 and the top plate 7. One end of an operation link L1 is pivotally attached to the shaft P1 with stud 3 provided on the base end of the shelf member 21 and a caster elevating and lowering member elevated, lowered and slid inside a leg base 2 is connected through the linking mechanisms L2 and L3 to the operation link L1. Since the attachment shaft of the caster 1 is connected to the caster elevating and lowering member, the caster elevating and lowering member is vertically moved by the tilting of the shelf member 21, the lower end of the caster is grounded by displacing the lower end of the caster to a position higher than a stand S fixed to a leg base bottom surface and only the caster is grounded by displacing it to the position lower than that.